Bonding and PEX pipe

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RDF said:
I don't disagree with your statement. It would be up to the AHJ to make that decision just as we had to but we also coordinated our decision with the 3rd party agencies that inspect outside of the city so that electrical inspections would be uniform throughout the area. It's difficult when one entity requires something different from another entity. You mentioned supplemental grounds with the water pipe electrode and CEE. Keep in mind that a supplemental electrode such as a ground rod, is only rated to clear up to a 100A fault. Hence the necessity for two electrodes in a GEC system. I doubt that by mid summer in many areas, a single ground rod would be able to clear that much of a fault but as people often point out, the code is the minimum, the worst you can possibly perform. With our aging and antiquated infrastructure and ever more sensitive electronic equipment, grounding and bonding is extremely important. It should be better taught and understood than it presently is. Most electricians that I encountered as an inspector knew how to ground and bond to the code requirements but often, many didn't fully comprehend why.
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that is nonsense. the grounding electrode system is not supposed to be used as part of the fault clearing path at all.
 
RDF said:
Since the code specifies that all electrical systems be connected to earth in 250.4(A)(1) and 250.4(A)(5) indicates that electrical equipment shall be installed in a manner that is capable of safely carrying the maximum ground-fault current likely to be imposed, it can be said that a ground rod clears a fault.
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The code does not require ALL electrical systems to be referenced to earth.

The ground rod cannot be relied on to clear fault current. The code even says that.
 
petersonra said:
The code does not require ALL electrical systems to be referenced to earth.

The ground rod cannot be relied on to clear fault current. The code even says that.
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Everyone is entitled to an opinion. I disagree with yours.
 
RDF said:
Everyone is entitled to an opinion. I disagree with yours.
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There is ungrounded and impedance grounded systems out there and they are recognized by NEC.

Such applications still do require bonding and grounding of non current carrying metallic components, like raceways and enclosures, but the supply system itself has no direct ground reference.
 
RDF: to avoid quoting the long post " that’s why a single ground rod is not code-compliant"
Sorry, no. If a single rod has a measured resistance of 25 ohms or less it is compliant.

"This question is the catalyst for many conversations"
Agreed.
"Most information about grounding is wrong" Mike Holt
 
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